2007 Lexus IS250 coolant temperature

109
2
When driving
2-2. Instrument cluster
Gauges and meters
The units used on the speedometer and the tachometer gauge display may
differ depending on the model/type.

The following gauges, meters and display illuminate when the engine
switch is in IG-ON mode.
Speedometer
Displays the vehicle speed.
Multi-information display
P. 118
Tachometer
Displays the engine speed in revolutions per minute.
Tacho indicator
When the set engine speed is reached while driving, this ring-shaped indi-
cators comes on in yellow. The indicator comes on in red when the engine
speed reaches a dangerous range.
Engine coolant temperature gauge
Displays the engine coolant temperature.

265
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■When working near the electric cooling fan or radiator grille:
Be sure the engine switch is OFF.
With the engine switch in IG-ON mode, the electric cooling fan may automatically
start to run if the air conditioning is on and/or the coolant temperature is high.
(P. 2 7 8 )
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting
in the eyes.
NOTICE
■If you remove the air cleaner:
Driving with the air filter removed may cause excessive engine wear due to dirt in
the air. Also a backfire could cause a fire in the engine compartment.

5
When trouble arises
335
5-1. Essential information
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air conditioning after use is normal.)
●Flat-looking tires or uneven tire wear
●Engine coolant temperature gauge needle continually points
higher than normal
■Audible symptoms
●Changes in exhaust sound
●Excessive tire squeal when cornering
●Strange noises related to the suspension system
●Pinging or other noises related to the engine
■Operational symptoms
●Engine missing, stumbling or running rough
●Appreciable loss of power
●Vehicle pulls heavily to one side when braking
●Vehicle pulls heavily to one side when driving on a level road
●Loss of brake effectiveness, spongy feeling, pedal almost touches
the floor

5
When trouble arises
375
5-2. Steps to take in an emergency
If your vehicle overheats
If your engine overheats:
Stop the vehicle in a safe place and turn off the automatic air
conditioning system.
Check to see if steam is coming out from under the hood.
If you see steam:
Stop the engine and carefully lift the hood.
If you do not see steam:
Leave the engine running and carefully lift the hood.
Remove the engine compartment cover. (P. 2 7 1 )
Check to see if the cooling fan is operating.
If the fan is operating:
Wait until the temperature of the engine (shown on the
instrument cluster) begins to fall and then stop the engine.
If the fan is not operating:
Stop the engine immediately and call your local Lexus
dealer.
After the engine has cooled
down sufficiently, check the
engine coolant level and inspect
the radiator core (radiator) for
any leaks.STEP1
STEP2
STEP3
STEP4
STEP5

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5-2. Steps to take in an emergency
■Overheating
If you observe the following, your vehicle may be overheating.
●The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
●Steam is coming from under the hood.
CAUTION
■To prevent an accident or injury when inspecting under the hood of your vehicle
●Keep hands and clothing away from the fan and other belts while the engine is
running.
●Do not loosen the radiator cap while the engine and radiator are hot.
Serious injury, such as burns, may result from hot coolant and steam released
under pressure.
NOTICE
■When adding engine coolant
Wait until the engine has cooled down before adding engine coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot engine too quickly
can cause damage to the engine.
Add engine coolant if required.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (P. 3 8 5 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

403
6-1. Specifications
6
Vehicle specifications
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat buildup and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic transmis-
sion, power steering, power brakes, power windows,
power seats, radio and heater, to the extent that these
items are available as factory-installed equipment
(whether installed or not)
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil and
coolant, and if so equipped, air conditioning and
additional weight optional engine
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the number of occupants speci-
fied in the second column of Table 1
* that follows

418
Alphabetical index
Door courtesy lights
Door courtesy lights.........................209
Wattage.................................................. 394
Door pockets........................................... 218
Doors
Door glasses ........................................... 45
Door lock.................................................... 19
Side mirrors ............................................. 43
Driver's seat belt reminder light ...... 341
Driving
Correct posture .................................... 59
Procedures .............................................. 90
Driving position memory ......................28
Electric power steering (EPS) .......... 148
Electronic key
If your electronic key battery
is discharged .................................... 369
Emergency, in case of
If the engine will not start ............... 366
If the shift lever cannot be
shifted from P ................................... 367
If the vehicle has discharged
battery .................................................. 372
If the warning buzzer sounds ...... 339
If the warning light turns on .......... 339
If the warning message is
displayed ............................................ 344
If you have a flat tire .........................358
If you lose your keys.........................368
If you think something is
wrong ................................................... 335
If your electronic key battery
is discharged .................................... 369
If your vehicle becomes stuck......377If your vehicle needs to be
towed ................................................... 328
If your vehicle overheats.................375
Engine
Compartment ..................................... 269
Engine switch ......................................... 98
Hood ....................................................... 266
How to start the engine .................... 98
Identification number ........................ 381
If the engine will not start ............... 366
Overheating .........................................375
Engine compartment cover ............... 271
Engine coolant
Capacity ................................................ 385
Checking................................................276
Preparing and checking
before winter........................................ 161
Engine coolant temperature
gauge ...................................................... 109
Engine immobilizer system ................. 54
Engine oil
Capacity ................................................ 384
Checking................................................ 272
Preparing and checking
before winter........................................ 161
Engine oil maintenance data ........... 275
EPS (Electric power steering) ......... 148
Event data recorder ............................ 337
First-aid kit storage belt ..................... 238
Floor mat .................................................. 237
Fluid
Brake ........................................................278
Washer................................................... 282
E
F

425
What to do if...
What to do if...
A tire puncturesP. 3 5 8If you have a flat tire
The engine does not start
P. 3 6 6If the engine will not start
P. 5 4Engine immobilizer system
P. 3 6 9If the battery is discharged
The shift lever cannot be
moved outP. 3 6 7If the shift lever cannot be shifted
from P
The engine coolant temperature
gauge enters the red zone
Steam can be seen coming
from under the hood
P. 3 7 5If your vehicle overheats
The key is lostP. 3 6 8If you lose your keys
The battery runs outP. 3 7 2If the battery is discharged
The doors cannot be lockedP. 1 9Doors
The horn begins to soundP. 5 6Alarm
The vehicle is stuck in mud or
sandP. 3 7 7If the vehicle becomes stuck